package homework917;

public class StringBuilderDemo {
    public static void main(String[] args) {
        /*
        //StringBuilder的创建方式
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");


        //String 和StringBuilder互转：
        String  str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str2 = builder3.toString();

         */

        String str = "好好学习java";
        StringBuilder builder = new StringBuilder(str);

        //append();追加内容，在末尾追加
        builder.append(",为了找个好工作");
        System.out.println(builder);

        //replace();替换部分内容
        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        //delete();删除部分内容
        builder.delete(0,8);
        System.out.println(builder);

        //insert();插入内容
        builder.insert(0,"活着");
        System.out.println(builder);

        //reverse();反转
        builder.reverse();
        System.out.println(builder);






      }
}
